EP3532228A1

EP3532228A1 - Deep-hole drilling method, tool for a deep-hole drilling machine, deep-hole drilling machine, and centrifugal casting pipe

Info

Publication number: EP3532228A1
Application number: EP17792023.8A
Authority: EP
Inventors: Detlev Lattner
Original assignee: Schmidt and Clemens GmbH and Co KG
Current assignee: Schmidt and Clemens GmbH and Co KG
Priority date: 2016-10-26
Filing date: 2017-10-26
Publication date: 2019-09-04
Also published as: BR112019007550A2; JP2019536640A; SG11201903129UA; RU2757411C2; RU2019111127A3; CN109843490A; SG10202103638VA; CN109843490B; CA3040358A1; US11440106B2; DE102016012907A1; US20190255624A1; WO2018078030A1; JP7280183B2; KR20190091438A; SA519401576B1; RU2019111127A; MX2019004392A; KR102657696B1

Abstract

The invention relates to a deep-hole drilling method for producing a pipe (104) with an inner profile having at least one recess extending helically along the inside of the pipe (104), wherein by means of a deep-hole drilling machine (100), a tool (1) having a base body extending along a longitudinal axis and at least one cutter arranged on the outer periphery of the base body is pulled or pushed through the interior of the pipe (104) and is thereby rotated about its longitudinal axis and therefore the cutter makes a cut along a helical cutting line on the inside of the pipe (104).

Description

DEEP HOLE DRILLING, TOOL FOR A DEEP-HOLE DRILLING MACHINE, DEEP-HOLE DRILLING MACHINE, AND SPINNING PIPE

The invention relates to a deep hole drilling method for producing a pipe, a tool for a deep hole drilling machine and a deep hole drilling machine.

Deep drilling or deep hole drilling is a machining process for the production and machining of holes whose diameter is between d = 0.2 to 2000mm and whose hole depth is usually greater than 3 times the diameter.

EP 1 525 289 B9 discloses a finned tube for the thermal cracking of hydrocarbons, which has inclined, helically extending inner fins relative to the tube axis.

WO 2010/043375 A1 discloses a nickel-chromium alloy with high oxidation and carburization resistance, creep resistance and creep resistance consisting of 0.4 to 0.6% carbon, 28 to 33% chromium, 15 to 25% iron, 2 to 6% Aluminum, up to 2% silicon, up to 2% manganese, up to 1, 5% niobium, up to 1, 5% tantalum, up to 1, 0% tungsten, up to 1, 0% titanium, up to 1, 0% zirconium, up to 0, 5% yttrium, up to 0.5% cerium, up to 0.5% molybdenum, up to 0.1% nitrogen, the remainder nickel including melting-related impurities known.

Against this background, the invention was based on the object, a manufacturing method and an apparatus for producing a pipe having an inner profile, the has at least one helically along the inside of the tube extending recess to propose.

This object is achieved by the deep hole drilling method according to claim 1 and by the tool for a deep hole drilling machine according to claim 6 and the deep hole drilling machine according to claim 1 1. Advantageous embodiments are given in the subclaims and the description below.

The invention is based on the basic idea that advantages are achieved if the cutting edge of the tool is not moved at a specific location within the tube alone in the circumferential direction and radial delivery of the cutting edge causes the section of the inner profile located at this point. According to the invention, the cutting direction of the cutting edge in the deep-hole drilling method should no longer be solely in the circumferential direction. Rather, the invention proposes to guide the cutting edge of the tool helically along the inside of the tube and in this way to produce the recess extending helically along the inside of the tube. For this purpose, the invention proposes in the context of the deep hole drilling method according to the invention, with a deep hole drilling a tool having a along a longitudinal axis extending body and at least one disposed on the outer periphery of the body cutting edge to push or pull through the interior of the tube and the tool to rotate about its longitudinal axis and / or to rotate the tube about its longitudinal axis so that the cutting edge makes a cut along a helical cutting line on the inside of the tube. Alternatively, the invention provides for pushing or pulling the tube with a device along its longitudinal axis via a tool which has a base body extending along a longitudinal axis and at least one cutting edge arranged on the outer circumference of the base body and thereby the tube about its longitudinal axis rotate and / or rotate the tool about its longitudinal axis, so that the cutting edge makes a cut along a helix-shaped cutting line on the inside of the tube.

This type of procedure has the advantage that the cutting edge leaves the tool more frequently, and thus makes it possible to allow the indexable insert to be replaced when the cutting edge is particularly preferably used, when the cutting edge is worn out. When cutting only in the circumferential direction and a stepwise movement of the

Tooling in the axial direction, when the cutting in the circumferential direction at the respective location is completed, leads to long engagement times of the cutting edge in the tube and has the problem that in a possibly necessary replacement of the cutting edge, the tool must be precisely reduced in place the cutting process was completed before the cutting edge was replaced. The method according to the invention thus provides for superimposed rotational movement and axial movement of the tool relative to the tube during cutting. In this case, the rotational movement and the axial movement can be coordinated with one another such that a helical cutting line of the cutting edge results on the inner side of the tube, which has the same pitch as that on the inside of the tube

Tube to be produced, helically on the inside of the tube extending recess has.

The invention is described using the terms Tieflochbohrverfahren, Tieflochboh- ren and deep hole drilling machine. It is understood that these terms are commonly used to describe a machining process or a drilling machine to be used in such a machining process, which are used to make and machine bores whose diameter is between d = 0.2 to 2000 mm and whose bore depth is usually greater than 3 times the diameter. In the context of the description of the invention, however, the terms deep hole drilling method, deep hole drilling and deep hole drilling machine should be understood as generally describing a machining method and a machine (device) which can be used for such a machining method with which the superimposed rotational movement and axial movement of the tool provided according to the invention relative to the tube during the cutting can be performed. So it is conceivable, for example, that the inventive method is performed with a lathe or a CNC machine. Both a lathe and a CNC machine offer the possibility of carrying out the rotational movement and axial movement of the tool superimposed by the invention relative to the tube during the cutting. Only in a particularly preferred embodiment, the terms Tieflochbohrverfahren, deep hole drilling and deep hole drilling machine are understood to describe a machining process or to be used in such a machining process drilling machine for the preparation and processing of holes whose diameter between d = 0 , 2 to

2000mm and the hole depth are usually greater than 3 times the diameter, are used.

The inventively provided superimposed rotational movement and axial movement of the tool relative to the tube during the cutting can be different

Wise ones are brought about.

In a preferred embodiment, the tool is pulled through the interior of the tube with a deep hole drilling machine and thereby rotated about its longitudinal axis, so that the cutting edge makes a cut along a helical cutting line on the inside of the tube. In particular, the tube is not preferred in this case its longitudinal axis turned. In a preferred embodiment, the tool is pushed through the interior of the tube with a deep hole drilling machine and thereby rotated about its longitudinal axis, so that the cutting edge makes a cut along a helix-shaped cutting line on the inside of the tube. In particular, the tube is not preferably rotated about its longitudinal axis. In a preferred embodiment, the tool is pulled through the interior of the pipe with a downhole drilling machine, thereby rotating the pipe about its longitudinal axis so that the cutting edge makes a cut along a helical cutting line on the inside of the pipe. In particular, the tool is not preferably rotated about its longitudinal axis. In a preferred embodiment, the tool is pushed through the interior of the pipe with a deep hole drilling machine, thereby rotating the pipe about its longitudinal axis so that the cutting edge makes a cut along a helical cutting line on the inside of the pipe. In particular, the tool is not preferably rotated about its longitudinal axis. In a preferred embodiment, the tool is pulled through the interior of the pipe with a deep-hole drilling machine, thereby rotating the pipe about its longitudinal axis and the tool about its longitudinal axis, so that the cutting edge makes a cut along a helix-shaped cutting line on the inside of the pipe. In a preferred embodiment, the tool is pushed through the interior of the pipe with a downhole drilling machine, thereby rotating the pipe about its longitudinal axis and the tool about its longitudinal axis so that the cutting edge makes a cut along a helical cutting line on the inside of the pipe. In a preferred embodiment, the tube is pulled over the tool with a device, thereby rotating the tool about its longitudinal axis, so that the cutting edge makes a cut along a helical cutting line on the inside of the tube. In particular, the tube is not preferably rotated about its longitudinal axis. In a preferred embodiment, the tube is pushed over the tool with a device, thereby rotating the tool about its longitudinal axis, so that the cutting edge makes a cut along a helical cutting line on the inside of the tube. In particular, the tube is not preferably rotated about its longitudinal axis. In a preferred embodiment, the tube is pulled over the tool with a device, thereby rotating the tube about its longitudinal axis so that the cutting edge makes a cut along a helical cutting line on the inside of the tube. In particular, the tool is not preferably rotated about its longitudinal axis. In a preferred embodiment, the

Punched tube with a device over the tool while the tube is rotated about its longitudinal axis, so that the cutting edge makes a cut along a helix-shaped cutting line on the inside of the tube. In particular, the tool is not preferably rotated about its longitudinal axis. In a preferred embodiment, the tube is drawn with a device over the tool while the tube is rotated about its longitudinal axis and the tool about its longitudinal axis, so that the cutting edge makes a cut along a helical cutting line on the inside of the tube. In a preferred embodiment, the tube is pushed over the tool with a device, thereby rotating the tube about its longitudinal axis and the tool about its longitudinal axis so that the cutting edge makes a cut along a helical cutting line on the inside of the tube.

In a preferred embodiment, the inventive method provides that the helically extending along the inside of the tube recess is produced by a plurality of cuts, the tool is pulled or pushed at each section through the interior of the tube and is thereby rotated about its longitudinal axis and / or the tube is rotated about its longitudinal axis, so that the cutting edge performs the respective section along a helical cutting line on the inside of the tube. In an alternative, likewise preferred embodiment, the tube is pulled or pushed over the tool in each cut, thereby rotating the tube about its longitudinal axis and / or the tool is rotated about its longitudinal axis, so that the cutting the respective section along a helical section line on the Performs inside of the tube. This procedure also makes it possible to load the cutting edge as little as possible by keeping the material removal per cut small and producing the cutout in several cuts. In a preferred embodiment, the recess is produced with at least three, in particular preferably with at least four, particularly preferably with at least five and with very particular preference with at least six cuts.

In a preferred embodiment of the above-described embodiment, in which the recess is produced with a plurality of cuts, the radial distance of the

Cutting edge changed relative to the longitudinal axis of the body between a first cut and a second cut. As a result, the cutting edge can be adapted to the increasing depth of the recess. Additionally or alternatively, it may be provided in a preferred embodiment, to provide the cutting edge of the tool by indexable inserts and to change the indexable insert between a first cut and a second cut. The term "cutting edge" in the present invention description is thus not limited to a specific cutting edge on a tool, but is generally used to describe the cutting edge that is currently located on the tool in the respective method step Tool formed cutting edge formed by the cutting edge of a first indexable insert and the blade located on the tool formed in a second step by the cutting edge of another indexable insert, then - unless otherwise stated - defies replacement the indexable insert and possibly therefore detailed change of the cutting geometry still spoken by the "cutting edge" of the tool.

In a preferred embodiment, a first cut is performed with a first cutting geometry and a second cut with a second cutting geometry. In particular, indexable inserts from the group with the type designations RNMG 160500, RPMT 160500, RCMT 160500 or RDMT 160500 are used. In a preferred embodiment, the cut to be performed in each case leads from one end of the tube to the other end of the tube. Although embodiments are conceivable in which a tube is to be produced with a helixformigen recess on the inside of the tube, which extends only over part of the longitudinal extension of the tube, for example, at the respective ends of the tube end zones are provided without recess. However, it is particularly preferred to produce tubes with a helical recess on the inside of the tube, which extends over the entire tube. This also has the advantage at the beginning of each cut, when the cutting edge comes into engagement with the material of the tube at the beginning of a cut.

In a preferred embodiment, a plurality of recesses of the tube are produced in the respective method step. In a preferred embodiment, the tube n has helically extending recesses along the inside of the tube. For this purpose, the method according to the invention provides, according to a preferred embodiment, for the deep hole drilling machine to pull or push the tool, which has a base arranged along a longitudinal axis and cutting edges arranged on the outer circumference of the main body, through the interior of the pipe and thereby to rotate its longitudinal axis and / or to rotate the tube about its longitudinal axis so that each of the cutting edges makes a cut along a helical cutting line on the inside of the tube. In an alternative, likewise preferred embodiment, the tube is pushed or pulled with a device along its longitudinal axis by means of a tool having a base body extending along a longitudinal axis and a blade disposed on the outer circumference of the base body, thereby rotating the tube about its longitudinal axis and / or the tool is rotated about its longitudinal axis, so that the cutting each perform a section along a helix-shaped cutting line on the inside of the tube. As described above for the one recess, the respective recess of the n recesses can also be produced by several cuts, wherein the tool is pulled or pushed at each cut through the inside of the tube and is thereby rotated about its longitudinal axis, so that the cutting the respective section along a helix-shaped cutting line the inside of the tube performs. Although it is conceivable in an alternative embodiment, in a tube with n helically along the inside of the tube extending recesses these recesses successively produce (possibly by performing several cuts per recess). However, the processing times are reduced if several cuts are carried out simultaneously for each work step. In a preferred embodiment, the number n of the recesses of the tube is> 3. It is not mandatory that work is carried out simultaneously on each step of the recesses of the pipe to be produced. Thus, it is conceivable, for example, to machine a tube with six recesses extending helically along the inside of the tube in such a way that with a tool having a base body extending along a longitudinal axis and three cutting edges arranged on the outer circumference of the main body only three out of the six recesses are made in the first sequence of operations, and then in a second series of operations the remaining three recesses of the six recesses are produced. It is also conceivable, first when driving through the first

Tube to perform each first cuts for the first three recesses, perform the second pass through the tube, the respective first cuts for the second three recesses, then at a third driving through - possibly after a change of a cutting insert having - the second cut for the first three recess to perform at a fourth

Passing through the tube to perform the respective second cuts for the second three recesses.

In a preferred embodiment, a drilling oil or cooling lubricant is introduced into the interior of the tube, which is opposite to the direction of pull or the thrust of the

Tool flows through the pipe. The drilling oil or cooling lubricant is used in particular to remove chips from the interior of the tube and / or to cool and / or lubricate the tool and / or the workpiece. In a preferred embodiment, the radial distance of the cutting edge relative to the longitudinal axis of the body is reduced after completion of a first cut (the cutting edge is displaced inwardly towards the longitudinal axis of the body), the base is inserted again into the tube until it is in place the starting position is from where the next cut is to be made, whereupon the radial distance of the cutting edge relative to the longitudinal axis of the base body is increased again and - in a preferred embodiment - chosen to be even larger relative to the previous step. This "retraction" of the cutting edge as the main body is returned to the starting point for the next cut reduces the risk of the cutting edge colliding with a protruding portion on the inside of the pipe or with any pipe still in the pipe In addition, in this way, the basic principle to rotate the body while returning to the starting position during the longitudinal movement at the same time, so to speak, almost back to the helixformigen course of the recesses. In a preferred embodiment, the base body is moved with "retracted cutting edges" alone in the longitudinal direction and guided on reaching its axial starting position for the next cut by rotating in a position in which the cutting edge assumes the correct starting position for the next cut.

In a preferred embodiment, the radial portion of the cutting edge is not changed relative to the longitudinal axis of the body during a cut. As a result, the construction of the tool can be significantly simplified because it can be dispensed with mechanisms that must perform a feed movement of the cutting edge during a cut. In a preferred embodiment, the tool is pulled or pushed through the interior of the pipe at a speed of more than 6 m / min, particularly preferably more than 9 m / min, or the pipe is moved at a speed of more than 6 m / min, more preferably more than 9 m / min, pushed or pulled over the tool. It has been shown that with higher speeds, a greater rest of the cutting process can be achieved, especially lower

Vibrations of the tool, the pipe and / or the cutting edges. This is especially true for workpieces (pipes) with tough materials. The speed specification relates in particular to the linear component of the movement, that is to say the speed of the movement in the direction of the longitudinal axis of the tube or of the tool.

The tool according to the invention for a deep hole drilling machine has a main body extending along a longitudinal axis and at least one cutting edge arranged on the outer circumference of the main body. Particularly preferably, the base body is tubular.

In a preferred embodiment, the tool has several, in particular more than three, arranged on the outer circumference of the base body cutting. In a preferred embodiment, at least two cutting edges are the same

Height along the longitudinal extent of the body, but arranged at different positions along the circumference of the body. Particularly preferred are blades which are arranged at the same height along the longitudinal extent of the base body, but at different positions along the circumference of the base body, symmetrically distributed over the circumference of the base body. In a preferred embodiment, the cutting edge geometry of the cutting edges, which are cher height along the longitudinal extension of the body, but at different positions along the circumference of the body are arranged the same.

In a preferred embodiment, at least two cutting edges are arranged at different heights along the longitudinal extent of the basic body and at different positions along the circumference of the basic body. Particularly preferably, two cutting edges are arranged at different heights along the longitudinal extent of the base body and at different positions along the circumference of the base body in such a way that they lie on a helical line. Particularly preferably, the position of the second cutting edge is rotated by less than 90 ° about the longitudinal axis relative to the position of the first cutting edge, in particular preferably by less than 45 °. In a preferred embodiment, the cutting edge geometry of the cutting edges, which are arranged at different heights along the longitudinal extent of the basic body but at different positions along the circumference of the basic body, is the same. In an alternative embodiment, the cutting edge geometry of the cutting edges, which are arranged at different heights along the longitudinal extent of the basic body but at different positions along the circumference of the basic body, is different. Also different cutting edge geometries are conceivable, for example one cutting edge, for example the front cutting edge with interrupted geometry and another

Cutting edge, for example, the following cutting edge with full, closed geometry.

In a preferred embodiment, the cutting edge is formed on an indexable insert, wherein the indexable insert is detachably provided as part of a cassette. Particularly preferably, an indexable insert is screwed to a part of the cassette.

In a preferred embodiment, the cassette is designed to be movable relative to the main body. In a preferred embodiment, the cassette is ground precisely on the circumference and is guided in an incorporated pocket in the main body of the tool. The cassettes may, in a preferred embodiment, slide in the pockets in a direction of adjustment.

In a preferred embodiment, the cassette can be displaced along an inclined plane that is at an angle to the longitudinal axis of the base body. As a result, an adjusting movement of the cutting edge can take place and the radial spacing of the cutting edge can be changed relative to the longitudinal axis of the base body. This can be achieved in a preferred embodiment in that the base of a pocket in the base body of the tool in which the cassette is arranged extends at an angle to the longitudinal axis of the base body. This can be achieved in an alternative embodiment in that the pockets in the main body of the Tool have no reason (downwardly open) and the arranged in the pocket cassette is supported by a arranged inside the main body push rod, wherein the push rod on its outer circumference at an angle to the longitudinal axis of the main body extending surface portions, on which the cassette is supported , If the push rod is moved relative to the pockets, the cassette moves along the surface section extending at an angle to the longitudinal axis of the main body and thus changes its distance from the longitudinal axis of the main body. In a preferred embodiment, a bar spring is provided which presses the cassette in the direction of the longitudinal axis of the base body. Alternatively or additionally, the cassettes can be forcibly guided over an introduced in an inclined plane of the push rod T-slot. In a preferred embodiment, an adjustment mechanism is provided for the position of a cartridge movable relative to the base body relative to the base body. The adjustment mechanism particularly preferably has a setting rod, for example a push rod, on the outer surface of which a cassette located in a pocket is supported. It can be provided a separate drive, with which the position of the adjusting rod can be changed relative to the remaining part of the body. As a result, an automatic adjustment of the position of the adjusting rod relative to the base body is possible. Alternatively, a manual adjustment can be provided. In a preferred embodiment, a provided on the outer circumference of the base body support plate is provided. With this, the position of the body can be determined within the tube during the cutting movement. In a preferred embodiment, a plurality of support plates are provided distributed over the circumference. In a preferred embodiment, at one end of the tool is a first group of circumferentially spaced support plates and at the opposite

End of the tool provided a second group of circumferentially distributed support plates.

In a preferred embodiment, the support plates are resiliently mounted in the direction radially to the base body. The resilient mounting can be achieved by springs, such as leaf springs or coil springs, which can be arranged below the support plate. It is also conceivable to achieve the resilient mounting by fluid pads, for example gas or hydraulic pads, which are arranged below the support plate. The resilient mounting of the support plates offers the advantage that the support plates can change their position in response to forces acting radially on them. This allows for a dodging of the support plates at Chips. However, it allows for a plurality of circumferentially distributed support plates a centering function. This allows the tool to self-center in the tube. The tool is more tolerant of its position relative to deviations of the tube, in particular with respect to a deflection or deviations from the circular cross-section. The tool is held by the support plates floating in the pipe.

In a particularly preferred embodiment, the tool according to the invention comprises a collet unit, more preferably a first collet unit at one end of the tool and a second collet unit at the second end of the tool. The collet unit has at least three, more preferably more than three collets, which each assume the function of a support plate. The respective collet is movably mounted on the outer periphery of the base body, in particular mounted pivotably about a pivot axis extending in the circumferential direction of the base body. Furthermore, the collet unit for each collet on a counterpart, which is also connected to the outer periphery of the base body and can be moved axially along the outer periphery. The counterpart is spring loaded so that axial movement of the counterpart along the outer periphery of the body from a first position to a second position biases the spring. The collets can with their free end in

System be pivoted with the counterpart. It is particularly preferred if the counterpart and / or the free end of the pivoting pliers have inclined contact surfaces. The use of oblique contact surfaces can cause a pivoting of the collet on the outer circumference of the base body first to a first contact between the free end of the collet and the counterpart arises and upon further pivoting of the collet on the outer circumference of the body to a Sliding the free end of the collet along the counterpart causes an axial movement of the counterpart, which biases the spring (the counterpart is pushed back against the spring). In this way, in a collet chuck the collet the function of a radial

Take over spring-mounted support plate. By the spring, a restoring force is exerted on the counterpart, which is translated by the oblique contact surface in a radially acting restoring force on the collet. In a preferred embodiment of the collet unit all counterparts of the collets are combined on one element, preferably on a ring which can be moved axially on the outer circumference of the base body. This ring is preferably designed with a conical surface, which can provide the inclined contact surfaces of the counterparts. Particularly preferably, the ring is mounted with play on the outer circumference of the base body, so that it can tilt about an axis perpendicular to the longitudinal axis of the tool. By a tilting of the ring, a spring package located behind the ring can be compressed to different degrees, whereby distributed over the circumference of the ring different sized axially acting restoring forces can be generated, which are translated by the oblique conical surface of the ring in different strong-acting radial restoring forces on the collets can.

In a preferred embodiment of the collet unit, the counterpart is biased in a preferred position. In a preferred embodiment, the bias voltage can be changed.

In a preferred embodiment of the collet unit, the spring of the counterpart on an abutment. In a preferred embodiment, the position of the abutment is axially adjustable on the body. By axial displacement of the abutment on the body, the bias can be adjusted.

In a preferred embodiment of the collet unit, the springs of the counterparts are provided by a single sleeve-shaped spring pack. The provision of a sleeve-shaped spring package offers advantages, in particular in cooperation with a ring which represents the summary of all counterparts.

The use of a collet assembly with pivoting collets as support plates offers the advantage that an inclined surface, namely the radially outwardly facing surface of the inclined collet comes into contact with the inner surface of the tube. This offers advantages especially for tough materials that tend to smudge. In the case of tough materials there is a risk with fixed bars that one edge of the fixed bar digs into the tough material or material builds up in front of this edge, which can lead to a tearing of the bar. In a preferred embodiment, on the outer circumference of the base body a

Nozzle for a drilling oil or cooling lubricant provided. Particularly preferably, a channel is provided within the body, which leads from a Bohröl- or cooling lubricant inlet of the body to the nozzle. In particular, a plurality of nozzles are provided for a drilling oil or cooling lubricant on the outer circumference of the base body. Additionally or alternatively, it may be provided in the context of the method according to the invention or in the context of the deep hole drilling machine according to the invention to flush the space between the outer circumference of the tool and the inside of the tube with drilling oil or cooling lubricant. This can be done, in particular, by introducing the drilling oil or coolant at one end of the tube into this intermediate space and leaving the intermediate space at the other end of the tube. In a preferred embodiment, the flow is tion direction of the drilling oil or coolant in opposite directions to the movement of the cutting edge during the cutting. Thus, if the blade is moved from one end of the tube to the other end of the tube, in this preferred embodiment, the drilling oil or coolant flows from the other end of the tube to one end of the tube. Alternatively, it can be provided, the flow direction of the

Drill oil or coolant in the same direction to the movement of the cutting edge to select during the cut.

The deep hole drilling machine according to the invention has a tool according to the invention and a linear drive for the tool with a rotary drive for the tool.

In a preferred embodiment, the rotary drive can deliver the cutting edge into at least two different starting points for a cut, wherein the starting points differ in their rotational position about the longitudinal axis. In the above, an embodiment has been described in which the body is moved with "retracted cutting edges" alone in the longitudinal direction and is guided on reaching its axial starting position for the next cut by rotating in a position in which the cutting edge is the correct starting position for the next cut The extent to which the base body has to be rotated after reaching the axial starting position depends on the shape of the helix to be produced, namely in which rotational position the cutting edge left the workpiece at the end of the cut relative to the starting point of the helix can be used to make a variety of different helical recesses, it must have the ability to deliver the cutting edge in at least two different starting points for a cut, the starting points differ in their rotational position about the longitudinal axis insbesonde Preferably, the deep hole drilling machine can deliver the cutting edge to any point of a 360 ° division, ie in total 360 or 3600 or 36000 or 360000 different starting points. Particularly preferably, the deep hole drilling machine can deliver the cutting edge into more than 360 different starting points for a cut, wherein the starting points differ in their rotational position about the longitudinal axis.

An inventive system has a deep hole drilling machine according to the invention with a tool according to the invention, wherein for the tool a plurality of different cassettes are provided, on which an insert having the cutting edge can be releasably secured. By the shape of the cassette, in particular by varying the distance of the connection point of the indexable insert with the cassette (usually the thread into which a insert holding the indexable insert on the cassette screw is screwed) of the surface with which the cassette is supported on the base body can the distance of the connection point of the Cutting plate to the longitudinal axis of the body and thus the distance of the cutting edge to the longitudinal axis of the body are affected. With such a system it becomes possible, while maintaining a basic body by choosing the appropriate cassette to process tubes with different inner diameters.

In a preferred embodiment, the inventive method is carried out with the deep hole drilling machine according to the invention. In a preferred embodiment, the tube is a centrifugally cast tube. In a preferred embodiment, the centrifugally cast tube according to the invention is made of an alloy with 0.4 to 0.6% carbon, 28 to 33% chromium, 15 to 25% iron, 2 to 6% aluminum, up to 2% silicon, up to 2% manganese , to 1, 5% niobium, to 1, 5% tantalum, to 1, 0% tungsten, to 1, 0% titanium, to 1, 0% zirconium, to 0.5% yttrium, to 0.5% cerium, up to 0.5% molybdenum, up to 0.1% nitrogen, the remainder nickel including fouling-related impurities. Particularly preferred is an alloy which individually and side by side 0.4 to 0.6% carbon, 28 to 33% chromium, 17 to 22% iron, 3 to 4.5% aluminum, 0.01 to 1% silicon, 0, 01 to 0.5% manganese, 0.01 to 1, 0% niobium, 0.01 to 0.5% tantalum, 0.01 to 0.6% tungsten, 0.001 to 0.5% titanium, 0.001 to 0, 3% zirconium, 0.001-0.3% yttrium, 0.001-0.3% cerium, 0.01-0.5% molybdenum, 0.001-0.1% nitrogen.

The centrifugally cast tube according to the invention has an inner profile which has at least one recess which extends helically along the inside of the tube, the centrifugally cast tube being produced by a method according to the invention. The centrifugally cast tube is in particular characterized by having an angle of inclination of 20 ° to 40 °, with respect to the tube axis inclined, helically extending inner ribs and in the form of a wavy line, each with the same radius of curvature mirror-inverted Rippentäler and rib caps, in which the flank angle (ß) of the respective Tangent at the point of contact of the two radii of curvature (R) with respect to the perpendicular to the radius (Ri) of the

Rippenkuppen touching circle in the summit point of each Rippentals or a Rippenkuppe 16 ° to 25 °. The centrifugally cast tube particularly preferably has one of the geometries of the internal ribs and rib valleys and rib caps as described in EP 1 525 289 A1.

The invention will be explained in more detail on the basis of exemplary embodiments of the invention showing drawings. Show:

Fig. 1 is a schematic, perspective view of a tool according to the invention in a tube showing the cutting line to be executed by the cutting edge of the tool; Fig. 2 is a perspective view of a tool according to the invention;

3 is a perspective view of a main body of a tool according to the invention with a portion of a removed push rod.

4 shows a subassembly of the main body according to FIG. 3 with an inserted subassembly of the push rod; Fig. 5 is a schematic side view of a deep hole drilling machine according to the invention and

Fig. 6 is a schematic side view of a collet unit. Fig. 1 shows an inventive tool 1 with a along a

In the base body 2, a push rod 4 is provided, which can be moved relative to the base body 2. The main body 2 of the tool 1 is connected to a drill pipe 101 (not shown in FIG. 1) of the deep hole drilling machine 100 via a thread, not shown in FIG. 1. The deep hole drilling machine 100 can pull the main body 2 over the drill pipe 101 both through the centrifugally cast tube 5 likewise shown in FIG. 1, and also during the pulling movement. With the dot-dash line 6, the cutting line is shown in Fig. 1, along which the cutting edge 3, the material of the centrifugally cast tube 5 intersects, while the main body 2 is pulled through the centrifugally cast tube 5 and rotated.

It can be seen from FIG. 1 that in an embodiment in which the main body 2 has a further cutting edge on its outer circumference, which is arranged at the same height as the illustrated cutting edge 3, but at a different position in the circumferential direction, For example, the illustrated cutting edge 3 opposite, at the same time a second helical cut is introduced into the centrifugally cast tube 5.

In the embodiment shown in FIG. 2, the tool 1 according to the invention has a main body 2, on the outer periphery of which cutting edges 3 are formed. The cutting edges 3 are made of indexable inserts 10. The indexable inserts

10 are each detachably connected to a part of a cassette 1 1, namely screwed to this. The cassette 1 1 is slidably disposed in a recess (pocket) on the base body 2. They are held by rod springs 14 in the recesses (pockets). 2, it can be seen that the push rod 4 in the region of the pockets and the cartridges 1 1 arranged in the pockets has a surface section 20 which extends at an angle to the longitudinal axis A of the base body 2. It is provided in the embodiment shown in Fig. 2 that the push rod 4 has two opposite surface sections

20, which each extend at an angle to the longitudinal axis A of the base body 2, since in the embodiment shown in Fig. 2 are each provided at the same height along the longitudinal axis A of the base body 2, two opposing blades 3 on opposite indexable inserts 10, the are each bolted to a portion of their respective associated cassette 1 1, wherein the respective cassette 1 1 is located in a respectively assigned pocket in the base body 2 and is supported respectively on the associated surface portion 20 of the push rod 4. 2, it can be seen that - when the push rod 4 is moved relative to the base body 2 - the respective cassette 1 1 along the obliquely extending, associated surface portion 20 of the push rod 4 slides and thus the position of the cutting edge. 3 can be changed relative to the longitudinal axis A.

In each case five blades 3 are arranged at different heights along the longitudinal extension of the main body 2 and thus at different positions along the circumference of the main body 2, so that they lie on a helical line. In each case two cutting edges are at the same height along the longitudinal extent of the main body 2, but at different positions along the circumference of the body

Basic body 2 arranged.

Fig. 2 also shows that the main body 2 of the tool 1 between two collet units 21 which are spring-loaded, is held.

FIG. 3 shows a perspective view of a main body 2 of a tool 1 according to the invention with a section of a removed push rod 4. It can be seen that the main body 2 can be assembled from subassemblies 22. This creates the possibility of adapting the length of the basic body 2 and / or the number of cutting edges of the main body 2 to the desired processing.

The portion of the removed push rod 4 shown in Fig. 3 shows that the push rod 4 can be composed of subassemblies 23, so that the adjustment of the main body 2 by an adjustment of the push rod 4 can be shown. In addition, Fig. 3 can be clearly seen how the running at an angle to the longitudinal axis A surface portions 20 can be performed.

Fig. 3 further shows that a base body 2 with five recesses (pockets) can be performed at the same height along the longitudinal extension of the base body 1, in each of which cassettes 1 1 can be arranged with inserts 10. Thus, with such a basic body 2 with a cut, five recesses extending in a hollow shape along the inside of the tube can be produced. The cassettes 1 1 and indexable inserts 10 are shown seated on the surface portions 20 on the left-most subassembly 23 of the push rod 4 for better illustration.

FIG. 4 shows a subassembly 22 of the base body 2 according to FIG. 3 with inserted subassembly 23 of the push rod 4. FIG. 4 illustrates that the subassembly 22 of the base body 2 has through holes 24 through which the fitting screws are guided, with which the individual Subassemblies 22 of the main body 2 can be connected to each other

Furthermore, FIG. 4 shows that the subassembly 23 of the push rod 4 in each case has, as part of the angularly extending surface section 20, a likewise angularly extending T-shaped groove 25. The cassette 1 1 has a (not shown in Fig. 4) T-shaped foot which engages in the T-shaped groove 25 and is guided in this displaceable. Between the T-shaped foot and the remaining parts of the cassette 1 1, a spring may be provided which acts on the remaining parts of the cassette 1 1 relative to the foot in the direction of a preferred position. In a movement of the push rod 4 in the longitudinal direction A, the foot moves within the T-shaped groove 25 and moves along this groove to the outside, so that the position of the cassette 1 1 can be adjusted relative to the longitudinal axis A.

5 shows a schematic side view of a deep hole drilling machine 100 according to the invention. The tool 1 according to the invention, which is connected to a drill pipe 101 via a thread, can be seen. A first drive unit 102 may rotate and axially push (push) or pull the drill pipe 101 (and thus the tool 1 connected to the drill pipe 101). The drive unit 102 has an angular indexing, so that the workpiece 1 can be introduced precisely into the pipe 104 to be machined in a desired angular position.

In the drill pipe 101, the push rod 4 extends to the drive unit 102, a further drive unit 103 is provided with which the axial position of the push rod 4 can be adjusted relative to the main body 2 of the tool 1. In Fig. 1, the tool is shown in a position between the left end of the pipe to be machined 104 and the right end of the machining pipe. To generate the helically along the inside of the tube 104 extending recess the tool 1 is moved with retracted blades 3 to the left end of the tube 104 and spent there in a desired angular position in the circumferential direction of the inside of the tube 104. Thereafter, the blades 3 are extended by axial movement of the push rod 4 relative to the base body 2 and then pulled with the deep hole drilling machine 100 of the tool 1 through the interior of the tube 104 and thereby rotated about its longitudinal axis, that the cutting edges 3 a section along a helical cutting line on the Perform inside of the tube 104.

The deep hole drilling machine 100 has a further drive unit 105, with which the pipe to be machined can be moved axially and rotated. The inventively provided superimposed rotational movement and axial movement of the tool relative to the tube during the cutting can thus be achieved by the drive unit alone or the drive unit 105 alone or by combination of the drive units 102, 105.

The collet unit 21 shown in Fig. 6 has three collets 40, each assume the function of a support plate. The respective collet 40 is pivotally mounted about an axis extending in the circumferential direction of the base body 2 pivot axis 41 (see pivot arrow B). Furthermore, the collet unit 21 has a conical ring 42 which is mounted displaceably in the axial direction on the outer circumference of the base body 2. The ring 42 unites the counterparts provided for each collet 40 in one element. The ring 42 is formed by a sleeve-shaped

Spring assembly 43 spring-loaded, so that an axial movement of the ring 42 along the outer periphery of the base body 2 from a first position (see Fig. 6) in a second position (further to the right of the position shown in Fig. 6) biases the spring assembly 43. The ring 42 is mounted with play on the outer circumference and thus can tilt about an axis perpendicular to the longitudinal axis A, for example, starting from the position shown in Fig. 6 above move more to the right, as below. As a result, 42 different strong restoring forces are generated over the circumference of the ring. The ring 42, which unites the counterparts to form an element, has a conically extending contact surface 44. The free ends of the collets 40 have obliquely extending contact surface 45. The use of oblique contact surfaces causes the first contact between the free end of the collet 40 and the ring 42 is formed during a movement of the collet 40 on the ring 42 and at a further pivoting of the collet 40 to the outer periphery of the base body 2 a sliding of the free end of the collet 40 on the contact surface 44th causes the ring 42 along an axial movement of the counterpart, which biases the spring assembly 43. In Fig. 6, an arrangement is shown in which the collets 40 are not biased; they rest against the outer circumference of the main body 2. The ring 42 and the abutment of the spring assembly 43 have been moved so far to the right in FIG. 6 that the spring package 43 is rebounded and does not press the ring 42 against the free end of the collets 40. This setting is the one representing the minimum diameter of the collet assembly 21. For example, FIGS. 2 and 3 show embodiments in which the collets 40 abut against the ring 42. It can be seen that the collets 40 protrude radially beyond the remaining parts of the main body 2.

The pivoting of the collets 40 on the outer circumference of the base body 2 is effected by the not shown in Fig. 6 contact the radially outwardly facing surfaces 46 of the collets 40 with the inner circumference of the tube. A smaller inner circumference of the tube forces the collets 40 further inward than a wider inner circumference of the tube. It can be seen that the provision of a plurality of collets 40 and deviation of the inner circumference of the tube can be collected by a circle. End of the spring assembly 43 is provided in the form of a threaded ring 47, an abutment. The threaded ring 47 has an internal thread and can be moved axially along a provided on the outer circumference of the base body 2 external thread 48 by turning. By the axial displacement of the threaded ring 47, the bias of the spring assembly 43 can be adjusted.

In Fig. 6, the base body 2 continues to the right with the part of the main body 2, which has the pockets and cassettes 1 1. To the left in Fig. 6, an external thread 49 is provided, with which the base body 2 can be connected to the drill pipe 101.

Claims

claims:

Deep-hole drilling method for producing a tube having an inner profile, which has at least one helix-shaped along the inside of the tube recess, characterized in that with a deep hole drilling machine, a tool (1) having a base body (2) extending along a longitudinal axis and at least one on the outer circumference of the base body (2) arranged cutting edge (3) is pulled or pushed through the interior of the tube and thereby about its longitudinal axis (A) is rotated and / or the tube about its longitudinal axis (A) is rotated, so that the Cutting edge (3) makes a cut along a helical cutting line on the inside of the tube

or

the tube with a device along its longitudinal axis (A) via a tool (1) having a along a longitudinal axis extending base body (2) and at least one on the outer periphery of the base body (2) arranged cutting edge (3) is pushed or pulled while rotating the tube and / or turning the tool (1) about its longitudinal axis (A) so that the cutting edge (3) makes a cut along a helical cutting line on the inside of the tube.

Deep hole drilling method according to claim 1, characterized in that the helix-shaped along the inside of the tube extending recess is produced by a plurality of cuts, wherein the tool (1) is pulled or pushed at each section through the interior of the tube and thereby about its longitudinal axis (A ) is rotated and / or the tube is rotated about its longitudinal axis, so that the cutting edge (3) performs the respective section along a helical cutting line on the inside of the tube

or

the tube is pulled or pushed over the tool (1) with each cut, while the tube is rotated about its longitudinal axis and / or the tool (1) is rotated about its longitudinal axis (A), so that the cutting edge (3) the respective section along a helical cut line on the inside of the tube performs.

Deep hole drilling method according to claim 1 or 2, characterized in that the radial distance of the cutting edge (3) relative to the longitudinal axis (A) of the base body (2) between a first cut and a second cut is changed. Deep hole drilling method according to one of claims 1 to 3, characterized in that the inner profile n helix-shaped along the inside of the tube has extending recess, and with the deep hole drilling machine, the tool (1) having a tubular, along a longitudinal axis (A) extending main body (2) and n on the outer periphery of the base body (2) arranged cutting edges (3) is pulled or pushed through the interior of the tube and thereby about its longitudinal axis (A) is rotated and / or the tube is rotated about its longitudinal axis, so in that the cutters (3) each make a cut along a helical cut line on the inside of the tube

or

the tube with a device along its longitudinal axis via a tool (1) having a along a longitudinal axis extending base body (2) and n on the outer circumference of the base body (2) arranged cutting edge (3) is pushed or pulled while the tube rotated about its longitudinal axis and / or the tool (1) is rotated about its longitudinal axis (A), so that the cutting edges (3) each perform a cut along a helical cutting line on the inside of the tube.

Deep hole drilling method according to one of claims 1 to 4, characterized in that a drilling oil or cooling lubricant is introduced into the interior of the tube and flows against the pulling or pushing direction of the tool (1) through the tube.

Tool for a deep hole drilling machine, characterized by a tubular body (2) extending along a longitudinal axis (A) and at least one cutting edge (3) arranged on the outer circumference of the base body (2).

Tool according to claim 6, characterized in that the cutting edge (3) on an indexable insert (10) is carried out, wherein the indexable insert (10) releasably connected to a part of a cassette (1 1) is connected.

Tool according to claim 7, characterized in that the cassette (1 1) relative to the base body (2) is movable.

Tool according to claim 8, characterized in that the cassette (1 1) along an inclined plane which is at an angle to the longitudinal axis (A) of the base body (2), can be moved.

10. Tool according to one of claims 6 to 9, characterized by a on the outer circumference of the base body (2) provided support plate (16). 1 1. Deep hole drilling machine with a tool according to one of claims 6 to 10 and a linear drive for the tool and a rotary drive for the tool.

12. deep hole drilling machine according to claim 1 1, characterized in that the rotary drive can deliver the cutting edge (3) in at least two different starting points for a cut, wherein the starting points in their rotational positions about the longitudinal axis (A) differ.

13. The method according to any one of claims 1 to 5, characterized in that it is carried out with a deep hole drilling machine according to one of claims 1 1 or 12.

14. The method according to any one of claims 1 to 5 or 13, characterized in that the tube is a centrifugally cast tube (5).

15. Centrifugal casting tube (5) having an inner profile, which has at least one helix-shaped along the inside of the tube extending recess, characterized in that the centrifugally cast tube (5) was prepared by a method according to one of claims 1 to 5 or 13.